Dental X-ray diagnostic device
US4082953A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1976 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | Apr 29, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05G1/44
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dental X-ray diagnostic device for the preparation of X-ray film pictures in which an X-ray radiation element is located exterior to the patient. A film holder is inserted into the mouth of the patient, and means is provided for setting the exposure time for switching off the X-ray tube high voltage upon reaching the dosage corresponding to optimum blackening of the film. An automatic exposure arrangement measures the exposure time and has a radiation detector attached to the film holder which is connected to a wireless transmitter. An antenna connected to a receiver, receives the transmitted signals and controls the switching circuit for switching off the X-ray high voltage supply. The transmitter is preceded by an integrator for a signal corresponding to the detector signal. A threshold switching circuit has a threshold selected so that upon reaching the dosage corresponding to optimum film blackening, it switches and applies a control signal to the transmitter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.